MRCOOL MDPHK12D Universal Electric Heat Kit for Packaged Units 12kW is an electric heating accessory designed to provide dependable supplemental heating for compatible packaged HVAC systems. It works by converting electrical energy into heat, delivering warm airflow through the unit during colder conditions. https://www.partshnc.com/mrcool-universal-12kw-electric-heat-kit-for-packaged-units-mdphk12d